It, well, depends. In my business, clients are often given the choice between a non-exclusive, perpetual, royalty-free license to basically do whatever with the

It, well, depends. In my business, clients are often given the choice between a non-exclusive, perpetual, royalty-free license to basically do whatever with the final product (which often includes code and graphics but not, for example, source PSD or AI files) or they get everything and pay more for the "buyout". Surprisingly, this works well enough that many clients opt for the non-exclusive license, and we get to re-use the code.